You know what I usually see in these kind of threads?
Media controlled opinions, proving people don't take the time to read between the lines, to realize the messages some rappers are trying to get into public view. You can only blame the business side, the producers of rap music, for this problem. They feel that the gangsta (death threats, and glock metaphors) and industry (booty shakin', repetitively radio broadcasted) genres of rap are the only thing that will sale. While Underground rap (my favorite genre) preaches about political injustice, police brutality and corruption, and basically what is wrong with society today.
I'm sure you might have have heard a few of the well known artists like Common, Mos Def, and Talib Kweli.
You'll find not one single curse word in their music, completely understand their basis, and will possibly even reflect for a moment once the song is over. I believe rap is a way to express yourself in a catchy and rhythmic fashion, the rhythm the song radiates, becoming the "cool" and "ambiently catching" factor that makes you want to listen in the first place.
The fact is, industry and gangsta rap gets all the better funded music production, while underground (where the original point of hip-hop is still a factor) is left struggling to produce, in the shadow of a manipulating beast, happily fed by cash cows like P. Diddy, Jermaine Dupri, and Dr.Dre.
Like I've said many times before...
"Rap has different genres, and you can't argue this point, then turn around and say that Rock has different genres."
Finally, I recommend this Common - I used to love H.E.R, it's bascially a song about the transformation of rap, from people expressing their problems to this ironical money, power, and respect game of twisted hear say.